Mounting for rock drills



July 8, 1952 F. M. sLATr-:R 2,602,638

MOUNTING FOR ROCK DRILLS Filed Aug. 27, 1948 in gag LFI (11 BY HIS ATTORNEY Patented July 8, 1952 l UNITED srArss atan ors-ICE MOUNTNG FOR ROCK DRLLS Application August 27, 1948, Serial No. 45,500

(ci. s55-5i) 3 Claims.

This invention relates to drilling mechanisms, and more particularly to a mounting for drilling tools of the drifter type commonly used for drilling the vert-ical walls of tunnels, quarries and the like.

One object oi the invention is to enable the mounting to be placed in and removed. from the operative position with a minimum of eort.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawings accompanying this specioation and in which similar reference numerals refer to similar parts, v

Figure 1 is a side elevation, partly broken away, of a mounting constructed in accordance with the practice oi the invention,

Figure 2 is a transverse View taken through Figure l on the line 2-2 looking in the direction indicated -by the arrows, i

Figure 3 is a view talen longitudinally through Figure 2 on the line'3-3, v

Figure l is a transverse vier.r taken through Figure 3 on the line 11i- 4, and

Figure 5 is a view taken through Figure l on the line 55.

Referring more: particularly to the drawings, the mounting, constructed in accordance with the practice of the invention, `comprises a frame 20 shown as being of Y-shape the stem 2! of which carries a pointer 22 for vengagement with the supporting surface E3, as for example the door of a tunnel or drift.

The dverging arms 2d of the frame 2Q are hollow to provide chambers 25 for the accommodation of plungers Zihaving heads 27 and actuating surfaces 23 thereon against -which pressure fluid may act for driving the plungers 25 outwardly in the chambers 25. The plungers 2t extend from the free ends of the arms v2li and also carry pointers 22 for engagement with a surface 2s lying opposite the surface 23;

The pressure uid used for actuating the plungers 26 is conveyed to the frame by a conduit 3i? which is connected to the stem El and has interposed therein a control valve 3l. The conduit opens into a passage 32 in the stem ilrwhich is also in constant communication with a conduit 33 serving to conveypressure fluid from the passage 32 to a rock drilll (not shown) supported by the mounting. Passages 31%' lead from the passage 32 to the chambers 275 and are controlled by throttle valves '35. n

Each throttle valve 35 is rotatable in a bushing ,3B inthe frame 20 and has a lever 3l whereby it may be manipulated, It is shaped externally for sealing engagement with a tapered surface y 38 in the bushing 36 and is held thereagainst by a spring 39 that seats at one end against the end of the throttle valve and at its other end against a plug t@ threaded into the bushing S5 to seal the end of the chamber il containing the throttle valve.

The portion of the chamber il containing the pressure fluid entering the chamber 4l from the passage 32 hows into the cavity l2 through a port fit and` is restrained yagainst return now by a spring-pressed valve i5 in the cavity Yi2 overlying the port lid,

An additional function of the throttle valve is to establish an Outlet for the escape'ofV fluid from the chamber 25. ingly provided in its periphery and in the transversc planeof the port d3 with a groove it that may be brought into registry with the branch of the passage 3d leading from the throttlevalve chamber to the chamber 25, and a passage fil in the portion of the throttle valve 'carrying the lever Si aiords communication between the groove it and the atmosphere.

The ports and passages in the throttle `valve are so arranged that when the throttle valve 35 occupies the position shown in Figure 5, and in which position the port d3 is in registry with the passage 3d leading to the chamber "'25pressure duid will flow from the chamber 4I through the port @d and, unseating the valve 55, will flow through the cavity i2 and the branch 34 into the chamber 25 and drive the plunger .outwardly` to press its lpointer against the supporting surface. And whenever it is intended to release the pressure uid from the ohamber the throttle valve is rotated to bring thev groove t6 into communication with the branch 3d leading to the chamber 25. The fluid may then be exhausted from the chamber through these channels and through the passage fl'lto the atmosphere.

Preferably, the free end portions of the arms 2s are rigidly braced with respect. to eachother by a bar it which may be permanently aixed to the arms in any well known manner, and on the intermediate portions of the arms '2d are brackets iS-5B shown as lbeing welded thereto to support a shaft 5l which has an enlarged end 52 extending into the bracket 6.19 and held against rotation with respect thereto bya key 53. At the The throttle valve is accord-- juncture of the shaft 5| and the enlarged portion 52 is a collar 54 to seat against the side of a rocker 55 pivotally mounted upon the shaft, and on the portion of the shaft lying on the opposite side of the rocker 55 is a sleeve 56 which extends through the bracket 50 to seat against the adjacent side of the rocker 55 for clamping said rocker selectively against pivotal movement upon the shaft 5|.

The sleeve is capable of a suitable degree of movement endwise within the bracket 50 and is held against rotary movement within the bracket by a key 51 and the portion of the shaft 5| projecting from the sleeve 56 is threaded and carries a nut 58 that acts against the outer end of the sleeve for pressing said sleeve against the rocker 55.

The upper surface 59 of the rocker 55 is atted on opposite sides of the shaft 5| to provide a seat for a clamp 60 which supports a bar 6| and consists of upper and lower sections 62 and 53, respectively. The lower section 63 is connected pivotally, -by a bolt B4, to one end of the rocker and the opposite end of the section 63 projects beyond the adjacent end of the rocker 55 and carries a bolt 65 and an L-shaped plate 66 on the bolt for clamping the section 63 to the rocker 55. The end surface of one leg 61 of the plate 66 seats against the lower surface of the clamp section 63 and the side surface of the other leg 68 seats against the underside of the end portion 69 of the rocker which flares outwardly on the opposite sides of the rocker, and has its outer surface curved to conform substantially with the path of movement followed by the bolt 65 when the clamp 60 is swung about the pivot bolt 64.

'Ihe upper section 62 of the clamp 60 is hinged to the section 63 by a pin 10 arranged in lugs 1| at one side of the clamp sections and is forced into clamping position against the bar 6| by a bolt and nut assembly 12 at the opposite side of the clamp sections.

The bar 6| is readily adjustable endwise in the clamp 60 and carries at one end a bearingY 13 which may be afxed to the bar in any well known manner and has a slot 14 extending transversely therethrough for the reception of a head 15 at the endof an arm 15 upon which it is intended to mount the rock drill. The head 15 is of cylindrical shape and of a width substantially equalling the width of the slot 14 but is rotatable within the slot to permit of the convenient positioning of the arm 16 angularly with respect to the bar 6 I. The head 15 is held coaxial with the bearing 13 by a bolt 11 which extends through the two and has its head 18 seating against one side of the bearing 13 and a nut 19 acting against the opposite side of the bearing for clamping the opposed sides of the bearing to the head 15.

The arrangement of the parts supported by the shaft 5| is such that the arm 16 may be swung about in a horizontal plane to either side of the bearing 13 in order to place a rock drill supported by the arm in a desired position with respect to the work. For this purpose the bar 6I may also be rotated about its axis and move axially within the clamp 60. The bar 6|, together with the arm 16, may also be swung in a horizontal plane about the bolt 64 and the clamp 58 may be conveniently secured in xed position on the rocker 55 by clamping the plate 66 thereagainst.

The entire assembly mounted upon the shaft 5| may, moreover, -be readily swung about in a vertical plane for drilling holes at different elevations along a working surface. This movement is imparted to the bar by a turn-buckle assembly comprising a screw 8| having the usual right and left hand threaded portions for cooperation with internally threaded sleeves 82 and 83 that are, respectively, connected to pivot pins 84 and 85 in the rocker 55 and in the frame 20. The pin 84 isvpositioned in the free end of the rocker 55 lying on the frame-side of the shaft 5|, and the pin 85 is seated in lugs 86 on the frame 28 adjacent the juncture of the arms 24.

The screw 8| is provided at its intermediate portion with suitable means for rotating it to tilt the rocker 55, as for example a ratchet wrench, only the casing part 81 and the handle 88 of which are shown.

In practice, the mounting is placed in an upright position in front of a working surface with the pointer 22 in the stem 2| engaging the surface 23, and one of the throttle valves 35 is next opened lto admit pressure fluid into the associated chamber 25. Such pressure fluid will move the plunger in said chamber outwardly and press its pointer 22 against the surface 29. The frame will then remain upright without manual support and may be rocked about the pointers 22 engaging the rock surfaces to place it in the precise position desired. After the frame has been suitably positioned the other throttle valve 35 is manipulated to admit pressure fluid into the other chamber 21 to force the associated plunger outwardly and thereby drive its pointer 22 into the surface 28. In this way the mounting will be supported by three pointers, one at one end and two at the vother and will strongly resist rotation about its axis when subjected to the jars, vibrations and thrusts of the rock drill.

Whenever it is intended to drill a series of holes in a horizontal plane, it is merely necessary to swing the arm 16 to the desired position about the bolt 11 and clamp the opposed sides of the bearing 13 against the head 15 for holding the arm stationary. The range of movement of the arm in this plane may be further extended by swinging the clamp 60 to either the right or left about the bolt 64. The rock drill may also be conveniently positioned for drilling holes at different elevations by merely rotating the screw 8| and thereby cause the rocker 55, together with the parts which it supports, to tilt either upwardly or downwardly about the shaft 5| to place the rock drill in the desired position.

I claim:

1. A mounting for rock drills, comprising a rock drill supporting frame having a stem, a foot piece on the stem for engagement with a supporting surface, a pair of legs integral with and diverging from the stem and each having a chamber, a shaft mounted on said legs, members mounted on said shaft for supporting a rock drill, fluid actuated plungers in the chambers and extending from the free ends of the legs for engagement with another supporting surface, and valve means in the frame for selectively controlling the supply of pressure fluid to the chambers.

2. A mounting for rock drills, comprising a rock drill supporting frame having a foot piece at one end for engagement with a supporting surface to support one end of the frame, means movable endwise in the frame and extending from the other end thereof for engagement with another supporting surface, a shaft, means on the frame to support the shaft, a rocker tiltable about the shaft, a clamp carried by the rocker,

and a, turn-buckle connected to the frame and to the rocker for tilting the rocker about the shaft. 3. A mounting for rock drills, comprising a rock drill supporting frame having a foot piece and a pair of cylinders diverging from the foot piece', means movable endwise in the cylinders and extending from the free ends thereof for engagement With a supporting surface, a shaft, means on the intermediate portion o f the cylinders to support the shaft, a rocker tiltable on the shaft, a clamp pivotally connected to the rocker, a rod in the clamp and adjustable endWise therein, and a turn-buckle pivotally connected to the frame and the rocker for tilting the rocker and the clamp about the shaft. Y

FRED M. SLATER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Slater Nov, 20, 1945 

